Portsmouth Harbour - Port Solent Weather Forecast

    • 17
    • 19

    Cloudy

    • 16
    • 20

    Cloudy

    • 13
    • 20

    Cloudy

    • 14
    • 20

    Sunny day

    • 15
    • 20

    Sunny day

    • 13
    • 20

    Cloudy

    • 16
    • 19

    Partly cloudy

Today 18 Sep London and South East England

Fine during the morning, with some warm sunshine after a cool start in places. Becoming breezier later, with thickening cloud eventually bringing a little light rain in places. Maximum temperature 23 °C.

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Portsmouth Harbour - Port Solent Temperature Statistics

September Temperature

Thorney Island (12km)

  • Lowest 12 September, 2026

    9.5 °C

  • Average September

    17.6 °C

  • Highest 3 September, 2026

    23.5 °C

Climate (2021–2026)

Thorney Island (12km)

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  • Average Low 2021–2026

    9 °C

  • Average 2021–2026

    12.4 °C

  • Average High 2021–2026

    15.6 °C
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